| 摘要 |
PURPOSE: A driving apparatus of a solenoid valve is provided to use a CPU(Central Processing Unit) port efficiently by controlling the drive ratio according to duty control signals with a constant current circuit and a current/voltage converting circuit, and to improve precision and reliability by driving the solenoid valve according to time constant. CONSTITUTION: A driving device of a solenoid valve is composed of a CPU(10) controlling a solenoid valve(40); a duty value setting unit establishing the duty rate according to opening and closing the valve; a driving unit(30) outputting a driving signal for opening and closing the solenoid valve; the solenoid valve; a varistor(VR) setting opening and closing voltage of the solenoid valve; a constant current circuit part(50) setting the output cycle of the driving signal; and a current/ voltage converting unit(60) forming the driving voltage according to the signal. The CPU port is used conveniently with controlling the driving signal according to the duty signal by the constant current circuit and the current/voltage converting circuit. The valve is driven accurately according to time constant.
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